Merge pull request #3450 from embik/adopter-upbound

Add Upbound as adopter

Author: kcp-ci-bot

ADOPTERS.md

@@ -8,3 +8,4 @@ Listed below are organizations that have adopted kcp in one way or another. We a
 | Kubermatic    | Kubermatic is building Kubermatic Developer Platform (KDP), an internal developer platform (IdP) product that uses kcp as its global API control plane.  | Development | [Product Website](https://www.kubermatic.com/products/kubermatic-developer-platform/) |
 | Faros.sh      | Faros is building a control-plane-as-a-service to access & manage multiple Kubernetes clusters across public and private deployments. | Development | - |
 | SAP           | SAP is developing an open reference architecture (ApeiroRA) with a Platform Mesh that leverages kcp as its foundation, enabling service providers to seamlessly connect and interact through unified KRM-based APIs in a cloud-edge continuum. | Development | [Website](https://apeirora.eu/) |
+| Upbound       | We use KCP within our Cloud Managed Control Planes product to provide multi-tenant access to the underlying hostcluster. | Production | - |